MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURING METHOD

• Main Authors: YAMASHITA KAZUTAKA, KOBAYASHI HIDEYUKI, SATO MAKOTO
• Format: Patent
• Language: English
• Published: 21.07.1999
• Edition: 6
• Subjects: ADHESIVES; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBEMICROSCOPY [SPM]; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; INKS; MEASURING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PHYSICS; POLISHES; SCANNING-PROBE TECHNIQUES OR APPARATUS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TESTING; USE OF MATERIALS THEREFOR; WOODSTAINS

PROBLEM TO BE SOLVED: To provide the magnetic recording medium in which the running performance and the durability are improved without deteriorating the electromagnetic conversion characteristics. SOLUTION: Bearing ratio Tp is set into 3 to 60% measured at the slice level of a depth 45 nm from a maximum height Rp in the surface recessed and projected shape measured by the observation of the surface of a magnetic layer by means of an atomic force microscope. Moreover, a difference Δμ between maximum and minimum values of a friction coefficient μ of the magnetic layer is set to 0.1 to 0.0001 under the measuring conductions of a contact area of 5 mm , a mass of 2 g, a load of 0.04 to 0.2N, a speed of 3 mm/s and a measuring distance of 140 mm.